/ Dictionary / Index P plasmin: Meaning and Definition of Find definitions for: plas•min Pronunciation: (plaz'min), [key] — n. Biochem. fibrinolysin (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: plasmin (Thesaurus) plasmid plasminogen Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language